EN ISO 24266:2020

SLOVENSKI STANDARD
01-januar-2021
Obutev - Preskusne metode za celoten čevelj - Vzdržljivost upogiba (ISO
24266:2020)
Footwear - Test methods for whole shoe - flexing durability (ISO 24266:2020)
Schuhe - Prüfverfahren für den ganzen Schuh - Biegebeständigkeit (ISO 24266:2020)
Chaussures - Méthodes d'essai pour toute la chaussure - Durabilité vis-à-vis de la flexion
(ISO 24266:2020)
Ta slovenski standard je istoveten z: EN ISO 24266:2020
ICS:
61.060 Obuvala Footwear
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 24266
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2020
EUROPÄISCHE NORM
ICS 61.060
English Version
Footwear - Test methods for whole shoe - Flexing
durability (ISO 24266:2020)
Chaussures - Méthodes d'essai pour toute la chaussure Schuhe - Prüfverfahren für den ganzen Schuh -
- Durabilité vis-à-vis de la flexion (ISO 24266:2020) Biegebeständigkeit (ISO 24266:2020)
This European Standard was approved by CEN on 20 September 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 24266:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 24266:2020) has been prepared by Technical Committee ISO/TC 216
"Footwear" in collaboration with Technical Committee CEN/TC 309 “Footwear” the secretariat of which
is held by UNE.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by May 2021, and conflicting national standards shall be
withdrawn at the latest by May 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 24266:2020 has been approved by CEN as EN ISO 24266:2020 without any modification.

INTERNATIONAL ISO
STANDARD 24266
First edition
2020-11
Footwear — Test methods for whole
shoe — Flexing durability
Chaussures — Méthodes d'essai pour toute la chaussure — Durabilité
vis-à-vis de la flexion
Reference number
ISO 24266:2020(E)
©
ISO 2020
ISO 24266:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
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below or ISO’s member body in the country of the requester.
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Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 24266:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
5.1 Method A . 2
5.2 Method B . 3
6 Sampling and conditioning . 5
7 Test method . 6
7.1 Method A . 6
7.2 Method B . 8
8 Test result . 9
9 Test report . 9
Bibliography .11
ISO 24266:2020(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 216, Footwear, in collaboration with
the European Committee for Standardization (CEN) Technical Committee CEN/TC 309, Footwear, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved

INTERNATIONAL STANDARD ISO 24266:2020(E)
Footwear — Test methods for whole shoe — Flexing
durability
1 Scope
This document specifies two test methods for the determination of the flexing durability of whole
shoes. The two methods might not give comparable results.
NOTE The selected test method depends on agreement between relative parties who use this test method or
product standards which reference this test method.
These methods are not applicable to the whole shoes with heel height more than 50 mm, or the thickness
of flexing area of the soles more than 25 mm, or flexing angle less than 45° according to ISO 17707:2005,
Clause 6.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 18454, Footwear — Standard atmospheres for conditioning and testing of footwear and components
for footwear
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Principle
The footwear specimen is repeatedly flexed through a specified angle about its normal flexing line by a
test machine. After a predetermined time or number of flexes the footwear is subjectively assessed for
signs of damage.
ISO 24266:2020(E)
5 Apparatus
5.1 Method A
5.1.1 Flexing machine. See Figure 1.
5.1.1.1 A means of firmly clamping any type of footwear at the heel and toe. A number of toe clamps
will be necessary to ensure all sizes of footwear can be clamped securely.
Key
1 flexing angle indicator
2 front holding clamp
3 rear holding clamp
4 shoe platform
5 flexing axis
6 test piece (whole shoe)
Figure 1 — Flexing machine (method A)
5.1.1.2 A system of flexing the footwear about its flexing line at a rate of (140 ± 10) cycles per minute
through a range of flexing angles.
5.1.1.3 A means of recording either the number of flexes or the duration of the test providing the speed
of the machine is constant and known.
5.1.2 Vernier callipers, to an accuracy of better than 0,02 mm.
2 © ISO 2020 – All rights reserved

ISO 24266:2020(E)
5.2 Method B
5.2.1 Flexing machine. See Figure 2.
5.2.1.1 The flexing angle can be adjusted between 0° to 55°, see Figure 2.
5.2.1.2 The flexing frequency can be adjusted between 100 cycles to 300 cycles per minute.
5.2.1.3 Sample holder shall be able to fasten the sample firmly to ensure it will not loosen during
test. The inclination angle of sample holder is adjustable to make sure test sample can be under normal
condition without flex in any directions when the machine is at the minimum flex angle.
5.2.1.4 A means of stopping the machine automatically after the specified flexing cycles.
5.2.1.5 A means of blasting air to the flexing area of sample to prevent overheat
...